English
Injectivity of PLift.map f is equivalent to injectivity of f.
Русский
Инъективность отображения PLift.map f эквивалентна инъективности f.
LaTeX
$$$\\forall {\\alpha \\beta} {f : \\alpha \\rightarrow \\beta}, \\operatorname{Injective}(\\mathrm{PLift.map} f) \\Leftrightarrow \\operatorname{Injective}(f)$$$
Lean4
@[simp]
theorem map_injective : Injective (PLift.map f) ↔ Injective f :=
(Injective.of_comp_iff' _ down_bijective).trans <| up_injective.of_comp_iff _